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Create a timeline that demonstrates the history of artificial intelligence. Output:
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1943: Warren McCulloch and Walter Pitts publish their paper on the first conceptual model of a neural network. 
1952: Alan Turing develops the Turing Test.
1956: John McCarthy coins the term “Artificial Intelligence”.
1966: First AI-based game playing program developed by Arthur Samuel.
1969: Stanford Research Institute develops the Shakey robot. 
1985: Expert systems become mainstream.